Re: [Xen-devel] [PATCH 0 of 3 v5/leftover] Automatic NUMA placement for xl

[Dario Faggioli <raistlin@xxxxxxxx>]

On Fri, 2012-07-20 at 13:00 +0100, Ian Campbell wrote:
> On Fri, 2012-07-20 at 12:43 +0100, Andre Przywara wrote:
> > On 07/20/2012 01:07 PM, David Vrabel wrote:
> > > On 16/07/12 18:13, Dario Faggioli wrote:
> > >> Hello again,
> > >>
> > > I think the tests should test a representative sample of common system
> > > configurations, available memory and VM memory requirements.  I'd
> > > suggest you'd be looking at 100s of test cases here for reasonable 
> > > coverage.
> > >
> > > One method would be to start with various 'empty' systems and pile as
> > > many differently sized VMs as will fit.  You may want both fixed test of
> > > reproducible tests and random ones.
> > 
> > 1. If we focus on placement only, I have good experience with 
> > ttylinux.iso. Those live distros can be killed easily at any time and 
> > you just need one instance of the .iso file on the disk.
> > 2. # xl vcpu-list | sed -e 1d | sort -n -k 7 | tr -s \  | cut -d\  -f7 | 
> > uniq -c
> > This gives the number of VCPUs per node (sort of ;-)
> 
> Ideally you wouldn't need a xen system at all for this, you just want a
> database of input configurations (host NUMA setup, existing guest
> layout) and hypothetical new guests and their mapping to the expected
> output. You can then feed these offline to the algorithmn and validate
> that the output is the expected one.
> 
Ok, I see. I like this and I think it should be done. I'll look into it.

Thanks and Regards,
Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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